Method of producing roughened wire nails.



' UNITED STATES Patented November 24, 1903.

PATENT OFFICE.

EPHRAIM S. MORTON, OF BROOKTON,

MASSACHUSETTS.

SPECIFICATION formingpart of Letters Patent No. 745,224, dated November24, 1903.

Application filed November 15, 1902. Serial No. 131,577. (No specimens.)

To all whom it may concern:

Be it known that I, EPHR-AIM S. MORTON, of Brockton,in the county ofPlymouth and State of Massachusetts, have invented certain new anduseful Improvements in Methods of Producing Roughened Wire Nails, ofwhich the following is a specification.

This invention relates to Wire nails which are provided with a roughsurface, whereby the nail is enabled to adhere more firmlyto thesubstance into which it is driven than nails having the ordinary smoothsurface imparted to the wire from which they are made.

The invention consists in the improvements which I will now proceed todescribe and claim.

In carrying out my invention I roughen the surfaces of a mass of wirenails by any suitable means, such as by immersion in a suitable acidsolution or by exposure to water, producing a surface such as may beproduced by rusting or oxidation. I then apply to the said roughenedsurfaces a paste composed of a mixture of combustible fluid materialadapted to be dissipated byheat, such as linseed or other suitable oil,and a powdered relatively refractory material, such as silica, which isthe preferred material, although other materials, such as lampblack orwhiting, may be employed. The nails thus treated are next subjected to asuitable degree of heat to consume or dissipate the oil and cause theresiduum, consisting mainly of the powdered material, to adhere firmlyto the previously-roughened surface of the nail. I also roughen saidresiduum, preferably by agitating or tumbling the nails and preferablywhile they are being heated, the tumbling operation causing the contactof the nails against each other to roughen the residual coating andenabling the nail to firmly adhere to the substance into which it may bedriven. Preferably the nails are placed in a tumbler which is adapted tobe heated, the heating and tumbling being carried on at the same time. Ifind that the powdered material is thus caused to adhere with suchfirmness to the nail that it cannot be removed by the pressure againstit of the substance into which the nail is driven,- so that it entersthe substance with the nail without being scraped off by contact withsaid substance.

The

ened surfaces a paste composed of a mixture of material capable of beingdissipated by heat, and powdered relatively refractory material,removing a part of said mixture by heat, and roughening the residuum.

2. The hereinbefore-described method of producing rough-surfaced wirenails, the same consisting in roughening the metallic surfaces of thenails, applying to the roughened surfaces a paste composed of a mixtureof material capable of being dissipated by heat, and powdered,relatively refractory material, removing a part of said mixture by heat,and tumbling the nails to roughen the residuum.

3. The hereinbefore-described method of producing rough-surfaced wirenails, the same consisting in rougheniug the metallic surfaces of thenails, applying to the roughened surfaces a paste composed of a mixtureof oil and powdered refractory material, heating said paste to removethe oily ingredient thereof, and roughening the residuum.

4. The hereinbefore-described method of producing rough-surfaced wirenails, the same consisting in roughening the metallic surfaces of thenails, applying to the said roughened surfaces a paste composed of amixture of oil and powdered refractory material, heating said paste toremove the oily ingredient thereof, and roughen the residuum.

In testimony whereof I have affixed my signature in presence of twowitnesses.

EPHRAIM S. MORTON.

tumbling the nails to Witnesses:

C. F. BROWN, E. BATCHELDER.

